6 - Sphaeromatidae::“Cute As Buttons”

16 ANTHURIDEA • ANTHUR1DAE
Key to families of Anthuridea
1. Mouthparts adapted for piercing and sucking, together forming
conelike structure Paranthuridae p£i
Mouthparts adapted for cutting, lamina dentata and molar usually
present 2
2. Pereopod 1 subchelate, with propodus expanded; pleonites generally
fused; if free, much shorter than wide Anthuridae A
Pereopods 1—3 subchelate, subsimilar; pleonites free, often as long as
wide Hyssuridae pC&
Family Anthuridae Leach, 1814
DIAGNOSIS Mouthparts adapted for cutting. Pereopod 1 usually markedly
different from remaining pereopods, subchelate with propodus more or less
inflated. Exopod of pleopod 1 operculiform, covering remaining pleopods.
Pleonites 1—5 fused, with fusion marked ventrolateral^ by short slits, occa­
sionally with dorsal grooves marking lines of fusion, or free; if free, length of
each pleonite much less than width. Pleotelson with pair of statocysts, or
single medial statocyst, or lacking statocysts.
Key to genera of Anthuridae
1. Pleopod 1, both rami contributing to operculum 2
Pleopod 1, only exopod operculiform 6
2. Antennal peduncle bearing serrate process Licranthura M>
Antennal peduncle lacking any serrate process 3
3. Pleopod 1 in 9, rami to some degree fused Eisothistos ?Z
Pleopod 1 in 9, rami free 4
4. Pereopods 1 and 2 subchelate, of similar size, propodi not noticeably
inflated 5
Pereopod 1 much larger and propodus more expanded, than
pereopod 2 Minyanthura